PID Control 3P T1T2T3 Step Response and Nyquist Plot

Cuthbert Nyack
Applet shows the frequency response(Nyquist plot) of a third order type 0 system with PID control.

With the eg parameters (8.0, 1.0, 1.0, 1.0, 1.0, Ti, Td, 1.0, x) show the P control plot(red) passing on the gain = -1 point giving an oscillatory system. changing to eg (8.0, 1.0, 1.0, 1.0, 1.0, 0.6, 0.56, 1.0, 1.72) shows both plots passing over the -1 point and both are oscillatory with w = ~ 1.72.



Gif image below show how the applet should appear.

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COPYRIGHT 2006 Cuthbert Nyack.